<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <title>输入数字N</title>
</head>
<body>
    <h1>请输入一个数字N：</h1>
    <form action="output.jsp" method="post">
        <input type="text" name="numberN" />
        <input type="submit" value="提交" />
    </form>
</body>
</html>
